Gemstone



FIG. 1 is a top plan view of a gemstone according to our new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a gemstone, as shown and described. 